Lesson Playlist: Adding and Subtracting Numbers up to 20
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00:36
Determining Whether to Add or Subtract to Solve Word Problems with Numbers up to 20
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00:42
Using Images to Solve Word Problems Requiring Subtraction within 20
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00:52
Writing Subtraction Equations with an Unknown for Word Problems with Numbers up to 20
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01:35
Writing Addition Equations with an Unknown for Word Problems Involving Numbers up to 20